I have a problem with DHCP IP distrbution.
My wireless environment is WLC2106 + 6 LAPs(1131AG).
The symptom is that WLC sometimes distributes duplicated IP addresses to clients, so WLC have wrong ARP tables.
Eventually, some clients which have duplicated IP addresses can't communicate with WLC and others as well.
Does anybody know how to solve this problem? (I think it's one of WLC bugs)
If so, please let me know.
Oh, I also have a log message relevant to this problem.
I attache the log message below
firmware version 18.104.22.168 "[WARNING] dtl_arp.c 1656: Unable to delete ARP mapping."
firmware version 22.214.171.124 "%DTL-4-ARPMAP_DEL_FAILED: dtl_arp.c:1818 00:40:ffffff96:ffffffae:38:fffffffe 10.1.31.66 Unable to delete ARP mappingIP belongs to 00:40:96:ae:49:18"
P.S : all of my clients use Cisco wireless interface card(CB21AB) and also use ADU(Aironet Desktop Utility).
I use only internal WCL DHCP server on this subnet, so there is nothing to affect it working wrong.